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• NiMH电池充电（Real-World NiMH Charging）　2008-11-30 15:34
  During bike trips， Ed uses Icom handie-talkies for communication. To keep the radios‘ batteries working， he uses a three-pack charger that he designed at his workbench. The charger has three 250-mA channels and one 100-mA channel so he can charge different packs. An early version of the GPS radio interface described in my October column accompanied us on our summer bicycling vacation （"HT Audio， GPS for APRS， and What Works，" Circuit Cellar 219， 2008）。 I hadn‘t finished the replacemen...
  

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• 工具时代（Tool Time）　2008-11-29 13:01
  Tom has often bemoaned that the tools electronic designers rely on haven‘t kept up with the silicon. The answer to his complaint may be Altium's Designer， which allows you to complete an entire design， including hardware and software， from start to finish. When you‘re done， debug with Altium's NanoBoard. Imagine you‘re embarking on a home improvement project-say， a kitchen remodel. Heading over to the local home improvement store you find all of the materials you need. There's finely mil...
  

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• Verilog介绍（An Introduction to Verilog）　2008-11-28 13:39
  If you are new to programming FPGAs and CPLDs or looking for a new design language，Kareem has the solution for you. In this article， he introduces you to Verilog. Although the hardware description language has been used in the ASIC industry for years， it has all the tools to help you implement complex designs， such as a creating a VGA interface or writing to an Ethernet controller. Programmable logic has been around for well over two decades. Today， due to larger and cheaper devices on the ...
  

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• 波束成形技术（Beamforming 101）　2008-11-27 19:20
  Beamforming enables you to find problems in your system before they occur. As Martin explains， you can perform your own investigation with a computer， a dual-channel A/D card， a pair of microphones， and some software. Tensions are high and a hostile submarine lurks in the waters just off the coast. A patient exhibits troubling symptoms-do layers of tissue mask a tumor？ A driver checks his mirrors and begins to change lanes but never sees the truck hiding in his blind spot. It‘s better to g...
  

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• 电子ID系统（Electronic ID System）　2008-11-26 12:37
  A Display for Text, Photos, and Slide Shows Jan‘s electronic ID system is an MCU-based electronic badge that displays color slide shows. Many electronic badges display scrolling text using a matrix of discrete LEDs. This low-power system features a graphical OLED display and can be easily upgraded to handle animation，video， or RF communication. Most of the time， we want to protect and hide our personal identification information. But， every so often，it helps to be easily identified. For in...
  

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• 性价比好的移动数据存储（Cost-Effective Mobile Data Storage）　2008-11-25 11:53
  Interface an SD Memory Card with an MCU When it comes to designing an embedded application， memory matters. In this article，Mandar explains how to expand a microcontroller‘s nonvolatile data storage capacity with an SD card. It's an intelligent way to handle the excessive memory requirements of typical embedded applications. In the last couple of years， the Secure Digital （SD） memory card has become a widely-accepted memory solution for a variety of portable devices and equipment， includi...
  

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• 一种动态牌的展示（A Dynamic Tile Display）　2008-11-24 22:07
  Board Layout, Real-Time Animation, and More John designed an expandable platform for light and animation. You can use it to create modular animated signs， animated puzzles， and more. The system features a tray and tiles，which are based on 8 × 8 LED displays. Once the tiles are synchronized， you can pick them up and rearrange them. Every time you turn on a computer screen or look at an animated sign， millions of pixels disappear into your work，your correspondence， or your entertainment. I...
  

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• 一种温度传感器的设计（Temperature-sensing Design）　2008-11-23 10:56
  Seeing Red (Infrared, That Is) As Tom explains， having all the MIPS and megahertz in the world means nothing unless your design has some meaningful real-world data to process. To gather such meaningful data， you need innovative sensors. This month， Tom introduces a handy option you should consider for your next temperature-sensing design-an infrared noncontact IC thermometer. This month， let‘s take a look at yet another new MCU-not！ Don‘t get me wrong. As far as I'm concerned， MCUs are t...
  

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• 传感器趣谈（It’s the Sensors, Stupid）　2008-11-22 16:01
  Your design is only as good as its sensors. With the latest sensors incorporating smarter silicon， alternative energies， and wireless technologies， the possibilities for your next system are limitless. This month， Tom shows you some of the interesting sensors he discovered at the 2008 Sensors Expo & Conference. I hope you‘ll forgive the headline. Consider it a last hurrah as the seemingly perpetual political season finally totters to an end. Posturing and pandering the headline may be，...
  

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• 电缆屏蔽试验(Cable Shielding Experiments)　2008-11-21 11:47
  Robert recently came across an old book about electronic design. After reading about the topic of noise coupling with various cables and wiring setups， he reproduced the cable shielding experiments described in the book. This month， he shares the results. Welcome back to the Darker Side. I always do my best to find a topic that coincides with the monthly Circuit Cellar theme， but this time I failed. I will not talk about signal processing，and I apologize. But I have an excuse. I just redisco...
  

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• 浅析非接触式遥感（A Look at Noncontact Sensing）　2008-11-20 13:32
  Jeff has covered optical encoders in previous columns. As you know， while they work well in some projects， they can be expensive. This month， Jeff describes an alternative based on magnetics. A noncontact rotary encoder may be the perfect fit for your next design. There is something comforting about knowing you have control over your destiny. When the automobile and airplane were first manufactured， all of their controls were mechanical. Failure of the controls on the ground was typically an...
  

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• 串行终端解决方案（Serial Terminal Solution）　2008-11-19 10:13
  Jeff used to keep an old laptop in his lab just because it had a real RS-232 port. But he found himself in the lurch recently when the laptop broke in the middle of a design project that required an RS-232 port for operational verification. Fortunately, Jeff had another work in progress that involved the hardware he needed to fix the problem. In this article, he describes his serial terminal solution. Serial terminals continue to be one of the most useful gadgets in our arsenal of peripheral equ...
  

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• C结构给我们带来了什么（What Can C Structures Do for You?）　2008-11-17 22:26
  This month， George gets back to work examining the C language. Follow along as he explores the use of C structures in a real-world application. Well， I hope you enjoyed the diversion of my last two articles on solar living. I‘ll now be dividing my time between the East Coast and the Southwest. Of course， I'll update everyone on the workings of my solar power system. But now it‘s time to get back to work and earn some money for the next big project. This month， I would like to explore the u...
  

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• HT音频和GPS怎样为APRS服务的（HT Audio, GPS for APRS, and What Works）　2008-11-16 21:29
  Several years ago， Ed built a system that enabled him to communicate with a fellow rider via an electret microphone connected to an amateur radio during bicycle rides. This month， he explains how he rebuilt the interface and combined it with a GPS tracking system. Seven years ago， I wrote about electret microphones and the circuitry that interfaced one with the amateur radio mounted on my recumbent bicycle. That circuitry let my wife and me talk during family rides and provide safety communic...
  

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• 气象监测电路(Weather-Monitoring Circuitry)　2008-11-16 11:30
  A Design for Indoor-Outdoor Use Brian‘s indoor-outdoor weather monitor project is an exercise in precision circuit design and accurate mathematical computations. The electronic system-which features relative humidity and barometric pressure sensors-was designed around an Atmel Butterfly evaluation module incorporated in a decorative wall mount. Like many people who make their living in electronics， I like to build electronic items for my home. However，almost any consumer gadget you can imagin...
  

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